To provide a working position sensor in a workbench, which prevents the unexpected fall of a worker working on a top plate out of the end of the top plate, by bridging a sensing bar between hand application bars to make the worker sense, on touching the sensing bar, that the sensing bar is the beam side end or the gable-side end of the top plate.
A plurality of pin insertion holes 11, 12 are formed on the upper end face of the respective hand application bars 5, a beam side end sensing bar 7 for making the worker sense, upon touching the bar 7, that the bar is the beam side end of the top plate 1, is bridged between the upper ends of the hand application bars 5, 5 facing in the top plate beam side direction of the hand application bar 5, ... erected on the four corners of the top plate 1, a gable-side end sensing bar 8 for making the worker sense, upon touching the bar 8, that the bar is the gable-side end of the top plate 1, is bridged between the upper ends of the hand application bars 5, 5 facing in the top plate gable-side direction, and an insertion pin 14 provided at both ends of sensing bars 7, 8 is inserted into either one of the pin insertion holes 11, 12 of the upper end face of the hand application bar 5.
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Hiroshi Masaki
Yuko Mikami